Atomic Number
45
Element 45
Rhodium (Rh)
Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, corrosion-resistant, and chemically inert transition metal.
Atomic Mass
102.91 u
Category
Transition Metal
Period
5
Group
Group 9: cobalt group
Phase
solid
Density
12.41 g/cm3
Electron Shells
2, 8, 18, 16, 1
Atomic Structure
Protons: 45. Electrons: 45. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d⁸
Why Rhodium Matters
Rhodium helps connect atomic number 45, transition metal behavior, period 5 trends, and electron shell structure. Its solid phase, atomic mass of 102.91 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d⁸ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Rhodium was discovered 1803 by William Hyde Wollaston. Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, corrosion-resistant, and chemically inert transition metal.
Safety and Handling Context
Rhodium is presented here for learning and comparison. Pure elements and laboratory compounds can have hazards that depend on dose, form, and setting.
Related Elements
Frequently Asked Questions
- What is the atomic number of Rhodium?
- Rhodium has atomic number 45, which means a neutral atom has 45 protons and 45 electrons.
- What is the chemical symbol for Rhodium?
- The chemical symbol for Rhodium is Rh.
- What category is Rhodium in?
- Rhodium is classified as a transition metal and sits in period 5 of the periodic table.
Explore Rhodium in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Rhodium to neighboring elements without losing your place.